摘要
本文应用镜下鉴定、阴极发光、电子探针、碳氧同位素及扫描电镜等手段,对皖南寒武-奥陶系各类白云岩的成因机制进行了探讨。不同类型的白云岩有不同的结构构造特征,其成因也各不相同。研究表明,下寒武统荷塘组盆地相泥晶白云岩为深海盆地有机质沉积物经硫酸盐还原带而形成的准同生白云岩。中、上寒武统斜坡带粉—细晶白云岩和下奥陶统仑山组台地边缘浅滩相中—细(粗)晶白云岩为交代成因的成岩白云岩,其成因分别属埋藏压实和深埋混合水白云化作用的结果,并建立了它们的成因模式。
An origin mechanism of Cambrian-Ordovician dolomites in southern Anhui was studied by microscopic examination,cathodolumines cence emission ana- lysis,C and O isotope assay,EMP and SEM.Different types of dolomites are of different textures and there by different origins.The study result has su- ggested that early Cambrian Hetang formation micritic dolomite of basin fa- cies is a penecontemporaneous dolomite formed from a deep marine basin se- diments of organic matter under sulfate reduction zone.The middle-lower Cambrian silty-fine crystalline dolomite in slope zone and early Ordovician Lunshan formation medium-fine crystalline dolomite of platform edge sands are diagenetic dolomites by replacement,resulted from burial and compaction under which a Mg^(?)-rich fluid was expelled and forced out.An original model is developed based on it.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1992年第1期13-22,共10页
Petroleum Exploration and Development
